I installed Sabayon 6 what now?

Open a terminal and become root. (you type in su and hit enter and then give your root password)

Now the first thing would be to update the repository database:equo update

It will now tell you there is 1 update available, glibc. This is an update that always must be installed before anything else so go ahead.
After installation it will re-spawn Entropy and continue asking to install the additional updates.

We stop here and first install the new entropy code with a trick so it doesn’t start pulling in huge dependency trees. Entropy does not need them to run anyway.

equo install entropy equo --relaxed

Once done we need to sort the mirrors. I noticed that on my test case it was set to a mirror in Australia. This is the other side of the globe and obviously not the best speedy connection I could get.

I’m newbie on Sabayon, I downloaded and installed the last release Sabayon 6 [Gnome]; I run the equo update and told me that the repository is already up to date. So i Think that there is no need to execute the other commands, right ?

You should go ahead and do so anyway, as it will not harm your system. The one that I’d recommend to run at the very least is ‘equo repo mirrorsort sabayon-weekly’. This checks all the servers that Sabayon updates from, and runs a speed-test on them, then selects the fastest one for your system to use. It takes a while, but it’s time well spent.